參數(shù)資料
型號(hào)： MSM9225GA-2K
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44
封裝： 9 X 10 MM, 0.80 MM PITCH, PLASTIC, QFP-44
文件頁(yè)數(shù)： 46/74頁(yè)
文件大小： 487K
代理商： MSM9225GA-2K
Semiconductor
MSM9225
50/73
The polynominal P(X) that generates the 15-bit CRC is expressed as follows.
P(X) = X15 + X14 + X10 + X8 + X7 + X4 + X3 + 1
The transmit node transmits a CRC sequence computed from all basic data bits of the start-of-
frame, arbitration field, control field, and data field, without bit stuffing.
The receive node, compares the CRC sequence computed from data bits of the received data
(excluding stuff bits) with the CRC sequence in the CRC field. If they do not match, the node
switches to an error frame.
DLC3
DLC2
DLC1
DLC0
0000
0001
0111
1000
Data length code
0
1
7
8
No. of data bytes
Data Length Code Setting
*
In the case of a remote frame, even when the data length code
≠ 0, there is no data field.
(d) Data field
The data field contains the number of data groups set by the control field. A maximum of 8
data groups can be set.
8 bits form 1 data group. (MSB first)
R
D
Data field
Data
(8 bits)
(Control field)
Data
(8 bits)
(CRC field)
(e) CRC field
A 15-bit CRC sequence checks for transmission errors.
The CRC field consists of a 15-bit CRC sequence and a 1-bit CRC delimiter.
R
D
CRC field
CRC sequence
(15 bits)
(Data field, control field)
CRC delimiter
(1 bit)
Ack field
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